welcome to the forum
Have you considered buying a used rack? Or building one from wood? Any decent local carpenter/builder can turn your sketched design into a rack as long as you provide some example RUBs and explain the heating system you'll be adding.
Anything else will depend on your current reptile keeping/breeding and business experience ... size of operation you want to start with ... UK, European, or International market? Working with something rare? Risking just one species?
Responsible breeding starts with you being certain that there is demand for the hatchlings.
Former snake keeper
Former breeder - Trinkets (C.helena) + Florida Kings (L.g.floridana) + Bamboos (O.p.coxi)
Now taking a break from the hobby
Will log in when notified of PMs (03-Jun-19)